1The population of the world ___still ___ now.

1The population of the world ___still ___ now.
A has; grown B will;grow C is growing D is; grown
2The whole family ____enjoying the beautiful music now.
A is all B all is C all are C are all
3The boss had them ____from morning to night.
A worked B working C work
4Let's wait for him _____he ____ back.
A until;will come B until;came C until;comes
5 The doctor was busy ____on the woman at that time.
A oerate B operating C to operate D operated
6When they walked along the river,they suddenly heard somebody ____for help.
A call B calling Ccalled D to call
7 this science book _____good care of.
A must be take B must take Cmust be taken D must to be taken
8We _____catch up with you.Please speak a little more slowly.
A can B can't C may not Dmust
9 This watch ______ next Monday.
A can mended Bcan be mended C can be mend D can be mending
10 The stars ____in the daytime.
A can't be see B can't see
C can't be saw D can' be seen
11 In 1850 ,about a third of USA _____ covered by forests.
A were B has been C was
12 Most of our earth ______coveresd by water.
A are B is C was D were
13 _____going to England by air next week.
A The Green family are B The Greens family are
C The Green's family are
谢啦.

ccccb abbbd cbb
1.population做主语如果没有分数,百分数修饰谓语动词用单数,有分数百分数修饰谓语复数,有NOW用现在进行时
2.family在这个句子里指的是家庭成员,所以用复数are,all做同位语放在系动词之后,行为动词之前
3have sb do sth让某人做某事,在此处是使役动词不是有的意思have sth to do 有某事要做
4until引导的时间状语从句主句表将来,从句要用一般现在是表将来时,在这句里let's 虽然用的一般现在时,其实等待的动作发生在说话之后,所以是将来
5be busy doing sth 忙于干某事顺便再告你一个短语be busy with sth也是忙于干某事的意思
6hear sb do sth 听见某人干了某事
hear sb doing sth 听见某人正在干某事
在这个句子里有suddenly突然所以用后者比较合适
7science book 和take care of 之间关系是被动关系,take 过去分词 taken
8can not 表能力,在这的意思是不能,may not 不可能.
9watch 和mend 之间为别动关系表被修情态动词被动语态：情态动词+be+v-ed
10.太阳在白天不能被看到解析同上.
see 的过去分词seen
11.在1850年提示要用过去时而不能用现在完成时排除has been.USA指美国国土,不可数名词,所以答案用was.分数,百分数作主语谓语动词看of 后面名词
12.earth 地球单数解析同上,外这句话说的是客观事实,所以要用一般现在时.
13.the +姓氏复数,做主语谓语动词复数,表示.一家人